Controls present in addition to
Three materials handling vehicles were operated in a 100,000 cubic-foot
Intermittent exposure ...................
warehouse room. The three drivers and two other workers were exposed
approximately 3 hours daily.
Gasoline-powered motor-generator units were operated indoors .............
a. Mechanical-exhaust tailpipe
extensions (15-20 cubic feet per
minute of air removed through
ventilation by means of two large
wall exhaust fans.
Machine gun firing of 20-and 30-mm ammunition was performed by 40
a. Local-exhaust ventilation at
persons indoors. The total time of exposure for each person averaged 1
some firing positions.
hour per day. Occasionally special tests increased the exposure time to 5 to
b. Intermittent exposure.
6 hours per day.
Hand-forging metal parts was performed by one man approximately 8 hours
b. Mechanical general ventilation
c. Intermittent exposure.
*Parts per million parts of air.